Development of a technique for the measurement of the radon exhalation rate using an activated charcoal collector

Iimoto, Takeshi; Akasaka, Yoshinori; Koike, Yuya; Kosako, Toshiso

doi:10.1016/j.jenvrad.2007.08.024

Cited by 21 publications

(7 citation statements)

References 13 publications

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“…74~77) Radon gas is directly adsorbed on a layer of granular active charcoal distributed over the ground surface, and then charcoal is subjected to -ray spectroscopy detector to estimate the amount of adsorbed radon gas. 6,8,9,35,40,74,78,79) This method has some advantages i.e. radon exhalation rate can be measured easily, the sampling procedures are simple, the charcoal is cheap and can be transported anywhere.…”

Section: Meas Ring Radon Exhalation Rate By Singmentioning

confidence: 99%

Radon Migration Process and Its Influence Factors; Review

Hassan

Hosoda²,

Ishikawa³

et al. 2009

Hoken Butsuri

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Radon (222 Rn) generated within the grains of rocks, soils, building materials and other materials by the radioactive decay of radium ( 226 Ra) can migrate to the atmosphere. This paper reviews the emanation coefficient, diffusion coefficient, and exhalation rate, and the factors that control the rate at which radon can enter atmosphere. The emanation coefficient which is the fraction of radon generated within the grains of materials and escaped to the pore space, varied from 2.1 to 32% for rocks, from 0.14 to 80% for soil, and from 0.10 to 58% in case of building materials. In addition, measurement methods used to evaluate emanation coefficient and its influence factors are also reviewed. The diffusion of radon is a process determined by radon concentration gradient across the radon sources and the surrounding air. The effective diffusion coefficient of some materials is summarized. Moreover, the radon exhalation rate process and the main influencing factors on the variation of exhalation rate data are reviewed. The exhalation rate varied in the range of 0.11 to 80 mBq m -2 s -1 , 2.0 10 -3 to 5.0 10 4 mBq m -2 s -1 and 4.0 10 -3 to 5.0 10 1 mBq m -2 s -1 for rocks, soils and building materials, respectively.

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Section: Meas Ring Radon Exhalation Rate By Singmentioning

confidence: 99%

Radon Migration Process and Its Influence Factors; Review

Hassan

Hosoda²,

Ishikawa³

et al. 2009

Hoken Butsuri

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“…For electron capture nuclides, such as 55 Fe, 41 Ca and 139 Ce, there can be more than one counting efficiencies corresponding to a given TDCR value, as the decay spectra are not continuous due to the contribution of two or more separated group of scintillation energy from conversion electrons and gammas. Thus, the introduction of a new parameter into the algorithm of counting efficiency determination would be required to yield a singlevalued efficiency vs. TDCR curve [46].…”

Section: Measureme Nt Chambermentioning

confidence: 99%

“…For measurement of Ra in air using LSC, radon is first adsorbed on activated charcoal in a small vial during a few days. Afterwards, radon is extracted from the charcoal into toluene or directly into an organic scintillation cocktail to be measured using LSC [138][139]. Radon emanation rates from soil can be also measured by LSC [140][141].…”

Section: Radonmentioning

confidence: 99%

Liquid scintillation counting for determination of radionuclides in environmental and nuclear application

Hou

2018

J Radioanal Nucl Chem

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“…The effect of humidity (Ronca-Battista and Gray, 1988;Scarpitta, 1992) and temperature (El Samman et al, 2002;Luetzelschwab, 1994) on charcoal canisters and PicoRad detectors have been extensively investigated in the past. Among others, Iimoto (2005Iimoto ( , 2008 showed that PicoRad measurements done in a high relative humidity environment, such as radioactive spas and other ground areas (mines, caves, tunnels, etc. ), resulted in a 15% decrease in adsorption efficiency for a 24-h radon collection period.…”

Section: Introductionmentioning

confidence: 99%